高压直流输电线路单端行波故障测距误差分析  

Error analysis of single terminal traveling wave fault location for HVDC transmission lines

作　　者：王宾[1] 杨林[1] WANG Bin;YANG Lin(State Key Lab.of Control and Simulation of Power Systems and Generation Equipments,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学电机系(电力系统及发电设备安全控制和仿真国家重点试验室),北京100084

出　　处：《电气应用》2020年第10期33-38,共6页Electrotechnical Application

摘　　要：快速准确的高压直流输电线路故障测距对于提高交直流混联电网的运行安全性非常重要。单端行波测距不受数千公里的通信可靠性及严格的两端同步性的影响,具有较好的应用前景。但是直流线路的边界对初始及故障点反射行波的特性影响不同,会造成较大的测距误差。针对该问题,给出了不同阶数滤波器作为直流输电线路边界时,故障后互感器检测到的初始波头的时域表达式,分析并仿真验证了初始及故障点反射行波的误差来源,为后续的单端行波测距算法改进奠定了理论基础。Fast and accurate fault location of HVDC transmission line is very important to improve the safety margin of hybrid HV AC-DC power grid. Single-terminal traveling wave fault location method is not affected by the reliability of thousands of kilometers of communication and strict synchronization of both ends, so it has a good application prospect. However, the boundary of DC line has different infuence on the characteristics of refected traveling wave at the initial and fault points, which will cause big fault location error. To solve this problem, this paper presents the time-domain expression of the initial current travelling wave head detected by the Current Transformer(CT) after the fault when the flters of different orders are used as the boundary of the DC line. And then the fault location error sources are analyzed and verifed, which lays a theoretical foundation for the subsequent improvement of the single terminal traveling wave fault location algorithm.

关 键 词：高压直流输电 故障测距 行波测距 边界特性 误差分析 

分 类 号：TM721.1[电气工程—电力系统及自动化]